Updated mediawiki/extensions
Project: mediawiki/extensions/WikibaseSolr  80f5ef44b43ebbf56ad02538fae018f45b654009
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Addresses various problems pointed out by Nikerabbit in https://gerrit.wikimedia.org/r/#/c/43850/

Change-Id: Ib6ad4531f5e2372e183931690fea044dd52a4d8f